STABLE MANURE AND NITKOGENOUS 



CHEMICAL FERTILIZERS FOR 



FORCING LETTUCE * 



S. A. BEACH AND H. HASSELBRINQ. 



SUMMARY. 



In the experiments here reported nitrogenous commercial fer- 

 tilizers were compared with each other as to their effect on the 

 forcing of lettuce. The particular forms in v.hich they were 

 tested were dried blood, nitrate of soda, dried blood and nitrate 

 of soda combined, and sulphate of ammonia. With each of these, 

 acid phosphate and muriate of potash were used in quantities 

 designed to exceed the needs of the crop. 



The use of these commercial fertilizers without stable manure 

 resulted in a decided increase in yield over crops on correspond- 

 ing untreated soil but proved inadequate for forcing the lettuce 

 in a suflBciently short time to be profitable. On the clay loam 

 with no stable manure a better yield was generally obtained 

 where nitrate of soda was used than where either sulphate of 

 ammonia or dried blood was used. On the sandy soil the results 

 with dried blood were generally superior to the results with the 

 nitrate of soda or sulphate of ammonia. With sulphate of 

 ammonia the results were very variable. 



Dried blood combined with the smaller percentage of manure, 

 gave, in the aggregate, better results than either nitrate of soda 

 or sulphate of ammonia similarly combined. 



The best crops were grown where the soil was fertilized with 

 stable manure. 



•Reprint of Bulletin No. 208. 

 21 



